A wasp settled on the head of a snake, and not only stung him several times, but clung obstinately to the head of his victim.  Maddened with pain the snake tried every means he could think of to get rid of the creature, but without success.  At last he became desperate, and crying, "Kill you I will, even at the cost of my own life," he laid his head with the wasp on it under the wheel of a passing wagon, and they both perished together.

What do you think that fable means?